Inhibition Effect Of Four Oil Dispersants On Primary Productivity In Qatar Water (Ararian Gulf)
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Four major oil dispersant mixtures in seawater wore used to depict their in—situ inhibition ratio to productivity rate of natural phytophanklon populations in Qatar water — Arabian Gulf — during the spring season of 1986. Results revealed that the highest gross production rate was attained in March (82 mg C m h ), while the highest net production rate Was in February (56 ing C in"3 h~'). The ratios between the net and gross production-rates were 83.60%. 57.30% and 38.95% for the monlhs of February, March and April respectively. The 50% relative inhibition in gross production rate due to dispersant mixtures ranged between 73-450 ppm and their threshold inhibition effect appeared between 2—57 ppm indicating their adverse effect on the marine ecosystem if misused or misplaced away from the slick area.